CentOS restart failed, always respawn

An error occurred while restarting CentOS. always respawnCentOS installed mysql. according to the Internet, init was changed. d, added datadir =... the path exists. I have verified it. it indicates that a restart is required, but the restart fails. it indicates that the restart is stopped at init. d, datadir = ..., commandn CentOS restart failed, always respawn
Mysql is installed on CentOS. according to the Internet, init. d is changed and datadir =... Path is added. I have verified it.
It indicates that a restart is required, but the restart fails. it is displayed as init. d, datadir =..., command not found, always respawn
The thread is continuously incubated, error occurs, and then the thread is killed. then, the thread continues and repeats continuously. the graphic login interface cannot be entered.
I installed CentOS 6.3, which is a developer environment configuration.
You cannot enter the system logon page (enter the user name and password)
There are a lot of software installed in it, and my installation experience, I really don't want to re-create a virtual machine.
Help ~~~~~~~~~~~~~~~~~~~~~~~~~~


------ Solution --------------------
Is it not configured?
[Root @ sample ~] # Chkconfig mysqld on startup
[Root @ sample ~] # Chkconfig -- list mysqld restart confirm that MySQL is started automatically
Mysqld 0: off 1: off 2: on 3: on 4: on 5: on 6: off okay if 2--5 is on
[Root @ sample ~] #/Etc/rc. d/init. d/mysqld start slave start MySQL service

Initializing MySQL database: [OK]
Starting MySQL: [OK]
------ Solution --------------------
In such a situation, there is no way to get in, but to reinstall it!